Corbyn could be set to delay Britain's EU exit with his proposed amendments

With the Supreme Court expected to rule against the Government and side with anti-Brexit campaigner Gina Miller, ministers are expected to fast-track legislation through the Commons within hours of the announcement to get Brexit negotiations underway as soon as possible.

However, if the ruling is against the Government then the Labour leader wants to put forward an amendment which would mean the Government is forced to enact a second vote on the final terms of any deal, potentially delaying the triggering of Article 50.

We think there will be a majority across the House of Commons, not just in our party but working with others and with Conservatives as well, to amend it in such a way that we get proper parliamentary scrutiny

John McDonnell

Labour are proposing that a vote should be held early enough to be sent back to Brussels if it needs to be “improved or amended”.

While Corbyn has maintained his party will not block Article 50 from being triggered, he still plans to table amendments “to make demands on rights, protections and market access”.

Shadow chancellor John McDonnell backed the Labour leader, claiming he felt there was enough Commons support for the amendment which would ensure MPs have an influence in Brexit talks over the two-year negotiation period.

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Speaking on the Andrew Marr Show on Sunday, he said: “We think there will be a majority across the House of Commons, not just in our party but working with others and with Conservatives as well, to amend it in such a way that we get proper parliamentary scrutiny.”

Former Work and Pensions Secretary Iain Duncan Smith has slammed the plan, claiming the party is trying to undermine the Government’s negotiating position despite the Prime Minister’s call for the country to unite ahead of Britain’s EU exit.

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Theresa May spoke with local business leaders in Warrington on Monday ahead of the landmark ruling

He said: "The deal is the deal, it's a take it or leave it option.

“This is a classic weasley game of trying to say something relevant.

Mr Duncan Smith continued: ”It is absurd. It is quite clear once they've been through all these tortuous negotiations that will be it. It would cause the whole thing to unravel.

“It tells you all you need to know about Labour's muddled, chaotic thinking."

The eleven justices of the Supreme Court will public announce the ruling at 9.30pm tomorrow and while Ministers have conceded they are likely to lose the verdict, Brexit campaigners are urging the Mrs May to trigger Article 50 as soon as possible.

Richard Tice, co-chairman of the pressure group Leave Means Leave, said: "Whatever the decision of the Supreme Court, it is vital the Government moves quickly to trigger Article 50.

“If the ruling is against the Government then a Bill must be introduced to the House this week and a clear timetable set out to ensure that Article 50 will be triggered by the end of March.

“If this is the case, it is merely a formality as MPs have already voted on whether the Government should trigger Article 50 and overwhelmingly honoured the democratic decision taken by the British people in the EU referendum.”